Abstract
Surface fatigue wear widely exists, and it occurs as long as a sufficient number of loading–unloading cycles are applied. Slowing down surface fatigue wear requires understanding the evolution of fatigue damage in the surface. Real surfaces are composed of many asperities; therefore, it is important to study the fatigue damage of a single asperity. A finite element model of an asperity subjected to cyclic elastic–plastic normal loading was developed under frictionless contact condition. The asperity can be either completely or partially unloaded in a loading cycle. For the sake of completeness, both cases were investigated in the present study. The multiaxial Fatemi-Socie fatigue criterion was adopted to evaluate the fatigue damage of the asperity in elastic shakedown state, which was achieved after several loading cycles. For the case of complete unloading, severe fatigue damage was confined in a subsurface ridge starting from the edge of the maximum loaded contact area. The shape and volume of the wear particles were predicted based on a fundamentally valid assumption. For the case of partial unloading, the fatigue damage was much milder. Finally, potential research directions to expand the current study are suggested.
Highlights
In this study, based on an elastic–plastic finite element model, the multiaxial FatemiSocie fatigue criterion was employed to investigate the fatigue microcrack position and potential fatigue wear particle in an asperity subjected to cyclic normal loading
The fatigue damage of a frictionless asperity subjected to cyclic normal loading was evaluated using the multiaxial Fatemi-Socie fatigue criterion
The shakedown analysis based on an elastic–plastic finite element (FE) model showed that all material points in the asperity entered the elastic shakedown state after a few loading cycles
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. There are myriad asperities on a rough surface [5]; it is crucial to study the fatigue of one single asperity subjected to contact loading. They found that after completion of the first loading cycle, no additional plastic deformation was accumulated in the subsequent cycles reaching elastic shakedown. Xu and Komvopoulos [15,16] explored the fatigue microcrack growth mode in an elastic asperity with initial crack subjected to cyclic adhesive normal contact and sliding contact. In this study, based on an elastic–plastic finite element model, the multiaxial FatemiSocie fatigue criterion was employed to investigate the fatigue microcrack position and potential fatigue wear particle in an asperity subjected to cyclic normal loading.
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